The technology department for Hall County schools is two-thirds of the way through with an $8.1 million project, has about 18,000 machines to maintain and added 9,000 Chromebooks to its arsenal during the past school year. “We’re a big business,” Aaron Turpin, technology director for the county, said, pointing out the system has 32,000 customers between students and staff. The department touches every part of the school system, including classroom instruction, storage of personnel records, the financial system, school nutrition and phone service.